
ML62Q1000 Series User's Manual
Chapter 6
Clock Generation Circuit
FEUL62Q1000
6-21
6.3.2 High-speed Clock
The high-speed clock is generated by multiplying the low-speed clock (LSCLK) by the high-speed oscillation circuit
(PLL oscillation circuit).
The oscillation frequency of PLL can be chosen from 24 MHz or 16 MHz through the code option.
It is also possible to output the high-speed output clock (OUTHSCLK) with divided frequency of high-speed clock from
a general-purpose port.
6.3.2.1
Configuration of PLL Oscillation Circuit
The PLL oscillation circuit generates the PLL oscillation clock by multiplying the LSCLK.
After high-speed clock oscillation is enabled (through setting ENOSC of the FCON register to "1"), HSCLK (high-speed
clock) is output by continuing count operation until the PLL oscillation clock is stabilized.
In addition, the PLL oscillation circuit stops oscillation when entering the HALT-H/STOP/STOP-D mode by the
software.
For the PLL oscillation stabilization time, two choices are available by setting the FHWUPT register: whether starting
the clock supply after it gets stabilized frequency, or starting the clock supply before it gets the stabilized frequency.
When set to start the clock supply before getting the stabilized frequency, the clock supply is start
ed approximately 30 μs
after the high-speed clock oscillation is enabled. The clock frequency reaches to the target approximately 2 ms after the
high-speed clock oscillation is enabled. Although the frequency within the 2ms is not guaranteed, it can be used for the
system clock.
See Table 4-4 for the time for restoration from the STOP/STOP-D mode.
See Chapter 4 "Power Management" for details of the STOP/STOP-D mode.
Figure 6-9 shows the configuration of the PLL oscillation circuit.
Figure 6-10 shows the operation waveforms at the start of the PLL oscillation circuit and in the STOP/STOP-D mode.
Figure 6-9 PLL Oscillation Circuit Configuration
Figure 6-10 High-speed Clock Operation Waveforms at Start of PLL Oscillation Circuit and in STOP/STOP-D Mode
PLL
oscillation
circuit
Low-speed
oscillation circuit
Wake-up
time
Enable
oscillation
Frequency select signal
(code option)
High-speed clock
HSCLK
FHWUPT
ENOSC
STOP/STOP-D mode signal
Control circuit
LSCLK
STOP
mode
HSCLK
supply
started
HSCLK
supply
started
External interrupt
occurred
Set in
FHWUPT
Set in
FHWUPT
PLL oscillation
waveform
PLL circuit oscillation
waveform
PLL circuit oscillation
waveform
PLL circuit
oscillation waveform
High-speed clock
(HSCLK)
STOP/STOP-D mode
FCON.ENOSC
FCON
: Frequency control register
FHWUPT : High-speed clock wake-up time setting register
PLL oscillation
Stabilization
time
Содержание ML62Q1000 Series
Страница 17: ...Chapter 1 Overview...
Страница 112: ...Chapter 2 CPU and Memory Space...
Страница 154: ...Chapter 3 Reset Function...
Страница 166: ...Chapter 4 Power Management...
Страница 196: ...Chapter 5 Interrupts...
Страница 248: ...Chapter 6 Clock generation Circuit...
Страница 274: ...Chapter 7 Low Speed Time Base Counter...
Страница 291: ...Chapter 8 16 Bit Timer...
Страница 320: ...Chapter 9 Functional Timer FTM...
Страница 382: ...Chapter 10 Watchdog Timer...
Страница 402: ...Chapter 11 Serial Communication Unit...
Страница 456: ...Chapter 12 I2 C Bus Unit...
Страница 491: ...Chapter 13 I2 C Master...
Страница 512: ...Chapter 14 DMA Controller...
Страница 531: ...Chapter 15 Buzzer...
Страница 550: ...Chapter 16 Simplified RTC...
Страница 559: ...Chapter 17 GPIO...
Страница 594: ...Chapter 18 External Interrupt Function...
Страница 612: ...Chapter 19 CRC Generator...
Страница 632: ...Chapter 20 Analog Comparator...
Страница 644: ...Chapter 21 D A Converter...
Страница 655: ...Chapter 22 Voltage Level Supervisor...
Страница 676: ...Chapter 23 Successive Approximation Type A D Converter...
Страница 709: ...Chapter 24 Regulator...
Страница 714: ...Chapter 25 Flash Memory...
Страница 743: ...Chapter 26 Code Option...
Страница 750: ...Chapter 27 LCD Driver...
Страница 788: ...Chapter 28 On Chip Debug Function...
Страница 795: ...Chapter 29 Safety Function...
Страница 813: ...Appendix A...
Страница 881: ...Revision History...